Pulley for hoisting-machines



(No Model.)

. s. STUTZ. I

PULLEY FOR HOISTING MACHINES.

No. 243,738 Patented July 5, 1881.,

5%?7255355 I wizgw UNITED STATES PATENT OFFICE.

SEBASTIAN STUTZ, OF PITTSBURG, PENNSYLVANIA.

PULLEY FOR HOlSTlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 243,738, dated July 5,1881.

Application filed May 23, 1881.

To all whom it may concern:

Be it known that I, SEBASTIAN STUTZ, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Pulleys forElevators or Hoisting Machines, of which the following is aspecification.

Myinvention relates to improvementsin pulleys for hoisting or elevatingmachinery; and the object of the invention or improvement is to preventloss of time and pieces. I attain this object by the constructionillustrated in the accompanying drawings, in which- Figures 1 and 2represent a pair of hexago nal pulleys fixed upon their shaft, inconnection with the elevator-chains. Figs. 3 and 4 represent details ofthe pulley, on a larger scale.

Similarletters refer to similar parts throughout the several views.

Polygonal pulleys employed for hoisting or elevating material upondifferent heights are constantly exposed to great wear, owing to thefriction of the chains. The parts most exposed are the corners, tendingcontinuously to cut in and acquire a circular form. As the windin gcapacity of the pulley greatly depends upon its polygonal angle, ithappens frequently that the chain, instead of being wound around, isslipping backward or remains stationary, because the corners are roundedand are unable to maintain the chain in its proper position.

(No model.)

The only remedy for such cases is the putting in of new pulleys. Thechange of pulleys constructed in one piece not only requires much timeand labor, but causes great loss of metal, to be thrown away or sold fora trifle.

To prevent such loss of time and money I have constructed the pulleyrepresented by Figs. 3 and 4 with its angle-pieces a a independent andfixed to their places either by bolts 12 or by rivets r, as the case maybe. The system is shown on a hexagonal pulley, but it may as well beapplied to any other polygonal form used for this purpose. Greatadvantages are gained by this system, as the change of angle-pieces canbe effected in a very short time and without taking the pulleys from theshaft or their place. The angle pieces may also be made of steel orother hard metal.

What I claim, and desire to secure by Letters Patent, is t 1. Apolygonal pulley for elevating or hoisting machines, havingindependentan gle-pieces fixed at its corners, substantially asdescribed, and for the purpose set forth.

2. In a polygonal pulley, the an gle-pieces a, secured to their placeseither by bolts b or rivets r, in combination with the pulley P, for thepurpose set forth.

SEBASTIAN ST UTZ.

Witnesses:

F. N. HOFFSTEL, S. 0. ARMSTRONG.

